Molding Process
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Material sticking to the sizing sleeve of EEA extruded pipe
Problem Phenomenon
EEA extruded pipe sticks in the sizing sleeve, longitudinal adhesion marks appearing on the inner wall
Cause Analysis
EEA is soft and easily adheres to metal surfaces; sizing sleeve inner wall rough Ra>0.4μm; sizing sleeve insufficiently cooled, surface temperature too high promoting adhesion
Solution
1) Polish the sizing sleeve inner wall to Ra<0.2μm; 2) Fully water-cool the sizing sleeve, surface <30°C; 3) Pass lubricating water containing 0.1% silicone oil emulsion through the sizing sleeve; 4) Apply a thin layer on the pipe surface to reduce adhesion
Key Takeaway
Sizing sleeve sticking is caused by elastomer adhesion characteristics; polishing and lubricating water are the key
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